http://nlvm.usu.edu/en/nav/vlibrary.html The National Library of Virtual Manipulatives provides one of the most comprehensive offerings of manipulatives on the web
http://www.mathplayground.com/games.html Mathplayground focuses on problem solving, logic puzzles and has math games that hit most topics covered at the middle grades.
http://resources.oswego.org/games/ Use Oswego's website if you want to customize a game to meet your needs or differentiate instruction for each student, this is the math site for you!
http://www.wmnet.org.uk/resources/gordon/Hit%20the%20button%20v9.swf
Hit the button game- timed practice that goes beyond the basic facts.
http://www.globalclassroom.org/rulergame200/index.html
Reading a ruler in inches from sixteenths to the inch. This game asks students to identify a measurement on the ruler, timed or not.
http://nlvm.usu.edu/en/nav/vlibrary.html
The National Library of Virtual Manipulatives provides one of the most comprehensive offerings of manipulatives on the web
http://www.starrmatica.com/standalone/starrMaticaComparingNumbersCometoOrder.swf
Student order three numbers, place value through hudred thousands.
http://www.mathplayground.com/games.html
Mathplayground focuses on problem solving, logic puzzles and has math games that hit most topics covered at the middle grades.
http://resources.oswego.org/games/
Use Oswego's website if you want to customize a game to meet your needs or differentiate instruction for each student, this is the math site for you!
http://www.hbschool.com/thinkmath/
Think math! by Harcourt... lots of activities, organized by topic and grade level.